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Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Sun Dec 13, 2015 7:11 pm
by shocky
scooterslag wrote:Clutch arm is longer than the brake arm so gives you more leverage, only problem is the aforementioned cable slot and it bends inwards when you try and fit it on the brake cam
Why not just use the late spanish one then ?
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Sun Dec 13, 2015 8:33 pm
by hendy
shocky wrote:scooterslag wrote:Clutch arm is longer than the brake arm so gives you more leverage, only problem is the aforementioned cable slot and it bends inwards when you try and fit it on the brake cam
Why not just use the late spanish one then ?
Tell me more Mr shocky. Is it longer?
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Sun Dec 13, 2015 8:40 pm
by shocky
this is a standard arm
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Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Sun Dec 13, 2015 8:46 pm
by shocky
Here's a Spanish one its about 10mm longer but I didn't hold the ruler at the end....
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Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Sun Dec 13, 2015 11:55 pm
by coaster
I an see that a longer brake arm will increase the leverage but it will require further travel of the brake lever...might make adjustment a bit tricky if there is any lost motion (wear or stretch) in the system.
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Mon Dec 14, 2015 7:49 am
by hendy
coaster wrote:I an see that a longer brake arm will increase the leverage but it will require further travel of the brake lever...might make adjustment a bit tricky if there is any lost motion (wear or stretch) in the system.
Dead right, but when you reverse pull it you reduce lever travel massively (in my case I'd estimate by a factor of 3) so this more than accounts for the extra travel needed at the bar. I'd estimate a clutch arm is about 40% longer.
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Mon Dec 14, 2015 9:58 am
by shocky
Maybe that's why they used dog leg levers
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Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Mon Dec 14, 2015 10:11 am
by EddieStone
(I'm tempted by this after Saturdays close shave with the back of a van. Am I right in assuming that if it locks up you can't do anything with it? If the cam goes over the shoes will stay on and you won't be able to get the hub apart, or move the scooter or anything until you apply enough force to get it back to its operating position again?
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Mon Dec 14, 2015 10:16 am
by bristolmod
I've done a few over the years both on standard discs and drums. I've never changed the actual arm on a drum set up, but have found that the length of the cut outer is critical to the success of the mod.
If the outer cable is not cut enough, the benefit of the reverse pull is small- if its cut too much then it will bind as the forks are turned.
I tend to cut to the approx length then rebuild the reverse pull set up and try it. If its not that good then trim and trim again by small amounts until it is spot on.
Chris
Re: stopping power for a Lambretta isnt limited to hydraulic
Posted: Mon Dec 14, 2015 11:36 am
by shocky
EddieStone wrote:(I'm tempted by this after Saturdays close shave with the back of a van. Am I right in assuming that if it locks up you can't do anything with it? If the cam goes over the shoes will stay on and you won't be able to get the hub apart, or move the scooter or anything until you apply enough force to get it back to its operating position again?
Yes in one word but whats the actual chance of that happening id say remote I ran one for years and never had a problem tbh I use the rear alot more than the front on a scooter unless its an external disc
